Red react reported error summary

Red react reported error summary

一、Uncaught TypeError: Cannot read property 'value' of undefined

Unknown type error: unable to read undefined property "value"

My source:
console.log(item.controlAttributeObj.placeholder.value)

wrong reason:　

The initial value controlAttributeObj {}, so the first time to obtain placeholder undefined, undefined attributes is not, so in this case not obtain the value attribute

Solve the error:
console.log((item.controlAttributeObj.placeholder || {}).value)